cuisle
Cuisle, f. 1. Vein. An fhuil ag rith trína chuislí, the blood coursing through his veins.

Cuisle na beatha, the great artery.

Cuisle na héigse, the fount of poetry. Scaoil cuisle na féile ann, he had a generous impulse.                               

2. Pulse. A chuisle mo chroí! My heart's pulse, my darling!